Danny Sullivan and Incisive Media to part company at the end of November. This is likely to impact on Clickz, Search Engine Watch and the Search Engine Strategies series of conferences. You can find out more about it from Danny in his own words here.
Danny along with John Battelle (of Battelle Media) and Charlene Li (of Forrester Research) is considered one of the key influencers in this space and has been an authority on the search market for about as long as it has existed.
Search Engine Roundtable has a good round-up of the moaning, wailing and nashing of teeth within the industry blogosphere at his departure.